The bathroom is of specific concern for plumbing access.- Improper footings/foundation - They have done some work to increase stability but looks as though it was not permitted, as is sometimes typical with early 1900s homes, there are no footings underneath the vertical foundation wall.

, "the roof has collapsed in the kitchen", "you have to be prepared to do plumbing, HVAC, etc." 

BRRRR method?

I think I’m going to go through with the cash out and try to shoot for the brrr method on this one.

They are used for the brrr method.

What methods are working best for you?

Not super old, it will have some things wrong with it but the structure and plumbing should still have a lot of life left in them.

I would like to continue investing in the area using the BRRRR method and buy and hold after this house hack. 

As I've gathered, the terminology and methods have changed somewhat over the years. 

GREAT Topic,Make sure you know exactly what you want done on this home @ New floor coverings, new kitchen, counter tops, new lights, new bathroom fixtures.New paint , @ tone paint, etc, etc,Because  you holding on to it as a rental make sure you get at least 10 year materials and product, namely floors and plumbing faucets.